
		window.onload = function() {
			var oDiv = document.getElementById("tab");
			var oLi = oDiv.getElementsByTagName("div")[0].getElementsByTagName("li");
			var aCon = oDiv.getElementsByTagName("div")[1].getElementsByTagName("div");
			var timer = null;

			for(var i = 0; i < oLi.length; i++) {
				oLi[i].index = i;
				oLi[i].onmouseover = function() {
					show(this.index);
				}
			}

			function show(a) {
				index = a;
				var alpha = 0;
				for(var j = 0; j < oLi.length; j++) {
					oLi[j].className = "";
					aCon[j].className = "";
					aCon[j].style.opacity = 0;
					aCon[j].style.filter = "alpha(opacity=0)";

				}
				oLi[index].className = "cur";
				clearInterval(timer);
				timer = setInterval(function() {
					alpha += 2;
					alpha > 100 && (alpha = 100);
					aCon[index].style.opacity = alpha / 100;
					alpha == 100 && clearInterval(timer);
				})

			}
		}
